92 lines
2.8 KiB
C++
92 lines
2.8 KiB
C++
/******************************************************************************
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* Copyright (C) 2021 Edelhirsch Software GmbH
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* SPDX-License-Identifier: BSD-3-Claus
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*****************************************************************************/
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#include "RadialTickmarksNode.h"
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#include <QskScaleTickmarks.h>
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#include <QskArcMetrics.h>
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#include <QtMath>
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RadialTickmarksNode::RadialTickmarksNode()
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: m_geometry( QSGGeometry::defaultAttributes_Point2D(), 0 )
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{
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m_geometry.setDrawingMode( QSGGeometry::DrawLines );
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m_geometry.setVertexDataPattern( QSGGeometry::StaticPattern );
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setGeometry( &m_geometry );
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setMaterial( &m_material );
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}
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RadialTickmarksNode::~RadialTickmarksNode()
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{
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}
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void RadialTickmarksNode::update( const QColor& color, const QRectF& rect,
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const QskArcMetrics& arcMetrics, const QskScaleTickmarks& tickmarks, int lineWidth )
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{
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if( lineWidth != m_lineWidth )
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{
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m_lineWidth = lineWidth;
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m_geometry.setLineWidth( lineWidth );
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markDirty( QSGNode::DirtyGeometry );
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}
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const auto hash = tickmarks.hash( 17435 );
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if( ( hash != m_hash ) || ( rect != m_rect ) )
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{
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m_hash = hash;
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m_rect = rect;
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m_geometry.allocate( tickmarks.tickCount() * 2 );
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auto vertexData = m_geometry.vertexDataAsPoint2D();
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const auto center = rect.center();
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const auto radius = 0.5 * rect.width();
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const auto needleRadius = radius - arcMetrics.width();
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using TM = QskScaleTickmarks;
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for( int i = TM::MinorTick; i <= TM::MajorTick; i++ )
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{
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const auto tickType = static_cast< TM::TickType >( i );
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const auto ticks = tickmarks.ticks( tickType );
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const auto startAngle = arcMetrics.startAngle();
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const auto endAngle = startAngle + arcMetrics.spanAngle();
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for( const auto tick : ticks )
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{
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const qreal ratio = ( tick - startAngle ) / ( endAngle - startAngle );
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const qreal angle = ratio * ( endAngle - startAngle );
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const qreal cos = qFastCos( qDegreesToRadians( angle ) );
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const qreal sin = qFastSin( qDegreesToRadians( angle ) );
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const auto xStart = center.x() - radius * cos;
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const auto yStart = center.y() - radius * sin;
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const auto xEnd = center.x() - needleRadius * cos;
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const auto yEnd = center.y() - needleRadius * sin;
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vertexData[ 0 ].set( xStart, yStart );
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vertexData[ 1 ].set( xEnd, yEnd );
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vertexData += 2;
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}
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}
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m_geometry.markVertexDataDirty();
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markDirty( QSGNode::DirtyGeometry );
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}
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if ( color != m_material.color() )
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{
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m_material.setColor( color );
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markDirty( QSGNode::DirtyMaterial );
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}
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}
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